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Патент USA US2119545

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350-286
June 7, 1938.
Search Room
0. K. KASPEREIT
2,119,545
PRISM
T 25:37
Filed March 22, 1937
lnvantur'
Dttc: K.Kaspareii
@- MWWZ
Patented June 7, 1938
2,119,545
UNITED STATES PATENT OFFICE
2,119,545
PRISM
Otto K. Kaspereit, Philadelphia, Pa.
Application March 22, 1937, Serial No. 132,356
1 Claim.
(Cl. 88--1)
(Granted under the act of March 3, 1883, as
amended April 30, 1928; 370 0. G. 757)
The invention described herein may be manu
roof-angle faces and at an angle of 40° to the
factured and used by or for the Government for
plane bisecting the roof angle forms one side of
governmental purposes, without the payment to a 50-80-50-degree prism as seen in Fig. 2. An
me of any royalty thereon.
emergent face I l is at an angle of 50° to the face
This invention relates to a prism.
l0 and perpendicular to the path of the rays re
The purpose of the invention is to provide a ?ected by the face Ill. The plane surface 12
one-piece prism designed to deviate the line of joining the entrant and emergent faces and one
sight through an angle of 90° in the horizontal of the roof-angle faces is at an angle of 7° 9'
plane and through an angle of 80° in the vertical 20" to the horizontal.
plane and to revert the image.
The rays of light entering the prism at the
A practical embodiment of the invention is face 5a are deviated by the roof-angle faces ‘I
illustrated in the accompanying drawing, in and 8 through an angle 90° in the horizontal
which,
plane and are directed onto the face In which
Fig. 1 is a plan view,
deviates them through an angle of 80° in the
Fig. 2 is a view in elevation of the entrant vertical plane, that is 80° to the plane bisecting
the roof angle. An inspection of the horizontal
face,
Fig. 3 is a view in elevation of the side opposite rays a, b, c, and the vertical rays a, d, e, shows
to the entrant face,
that the image will appear reverted in the
Fig. 4 is a view in end elevation.
emergent face II.
Referring to the drawing by characters of ref
I claim:
erence, the angle alpha is equal to 45°, the angle
A single prism for inverting an image embody
beta is equal to 50°, the angle gamma is equal to ing an entrant face for rays of light, roof-angle
90°, the angle delta is equal to 80°, the angle
epsilon is equal to 120°, and the angle zeta is
equal to 7° 9' 20",
The prism consists of a single block having
parallel faces 5 and B as seen in Fig. 1, a portion
58 of the face 5 being the entrant face. Oppo
site the face 5 is a roof-angle surface having faces
30 1 and 8 inclined to each other at an angle of 90°
and its ridge 9, extended, making an angle of 45°
with the face 5, extended. A re?ecting face l0
disposed in the path of the rays re?ected by the
re?ecting faces disposed opposite to the entrant
face and having its ridge at an angle of 45°
thereto, said roof-angle faces deviating rays of
light through 90° in a plane bisecting the roof
angle, a re?ecting face disposed in the path of
the rays re?ected by the roof-angle faces and at
an angle of 40° to the plane bisecting the roof
angle for deviating the rays 80° to the plane bi
secting the roof angle and an emergent face
making an angle of 50° with said re?ecting face.
O’I'I‘O K. KASPEREIT.
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